For months I was having problems with the car been underpowered before it hit the turbo and it juddering like a cranky train when I shut the ignition off. Then a couple of weeks ago, I changed the alternator and the car ran like brand new. There wasn't juddering and torque was first class.
Today I took the EGR valve off to give it a clean and not only has the EML not gone off but I have got the exact same problem with underpowered revs and engine juddering as I did before!
Anyone have any suggestions of what could be wrong?